A Mixed Switching Event-Triggered Transmission Scheme for Networked Control Systems

Switching approaches are commonly used to design event-triggered (ET) control schemes for reducing the communication overhead in networked control systems. This article develops a mixed switching event-triggered (SET) transmission scheme by interpreting the resultant closed-loop system as a switching between systems under time-trigger, self-trigger, and discrete event-trigger with a dynamical threshold. For stability analysis, a novel looped-functional is constructed by introducing additional integrals. An asymptotic stability criterion is further derived in terms of linear matrix inequalities. For direct comparison between different transmission schemes, we also demonstrate the criterion by applying it to systems under time-trigger, discrete SET, SET, discrete ET, and continuous ET. The looped-functional is then employed to the robust stabilization of the systems with transmission delays and external disturbance. Finally, numerical simulations corroborate that the proposed MSET leads to (often considerably) fewer transmissions than other schemes.